The 9.1 ounce Pertex Shield+ Helium HD is completely waterproof and breathable, offers all the smart features of our trusted Helium II and adds critical extra features that serious backpackers and alpine climbers demand. These include zippered hand pockets, a wire-brimmed hood, pit zips, a key clip and our proprietary Halo Hood, which preserves peripheral vision while sealing out nasty weather. And like the Helium II, the Helium HD is super compressible, stuffing into its own pocket.